package com.ckd.flyingtrip.utils;
import java.security.MessageDigest;

public class SHA1Util {
	public final static String Sha1(String s) {

		char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };

		try {
			byte[] btInput = s.getBytes();
			// 获取MD5摘要算法的MessageDigest 对象
			MessageDigest mdInst = MessageDigest.getInstance("sha-1");
			//使用指定的字节更新摘要
			mdInst.update(btInput);

			// 获得密文
			byte[] md = mdInst.digest();

			// 把密文转换成十六进制的字符串形式
			int j = md.length;

			char str[] = new char[j * 2];

			int k = 0;

			for (int i = 0; i < j; i++) {
				byte byte0 = md[i];
				str[k++] = hexDigits[byte0 >>> 4 & 0xf];
				str[k++] = hexDigits[byte0 & 0xf];
			}

			return new String(str);

		} catch (Exception e) {

			return null;
		}

	}
}
